Ka-Bar TDI Law Enforcement Zytel (2.31" Black AUS-8A) 1477CB Kabar TDI Law Enforcement Knife, Coyote Brown, ComboEdge In extreme close quarters encounters where a suspect is attempting to take an officer's handgun, or an officer cannot access his handgun, the TDI knife is available as a "last option" knife. When... $72.95 $48.99 Choose Options Compare